what should I do?

I currently drive a 1993 gmc 1500 2wd, regular cab long box. It has a 305CI TBI with an auto trans(4L60-E) in it and it has a 308 rear end. It currently is my daily driver but when I'm done my rebuild I am hoping for it just to be a for fun project truck. I bought a 350 TBI out of a 95 pickup and it is at the machine shop as we speak its getting bored 30 over with flat top pistons 4 valve release. Im hoping to be pushing 400hp when im all said and done which is a lot of work I know but it will be my project truck. I was going to put in a carb and a manual trans so I can take out the computer. Im going to put a good set of headers on it and a good intake. I have an full edelbrock fuel system with a liftpump as well as, AFR 195 heads. What kind of camshaft should I run in this 350 I want something lumpy and mean sounding with some good power. The machine shop was thinking I should go with comp cams 477 480lift (part # 12-600-4). What are peoples thoughts about this? How does everything sound?

The mean sounding cam will cost you in mileage. I lost 5 mpg with a 350 in a Nova with a cam change and only gained a tenth in 1/8th mile performance. If you are street driving it I would go with a street roller, higher lift and less duration. Sacrifice some high end HP for low end and it will be a much more streetable machine. Remember the more duration on the cam the more stall you will need to be able to street drive it and idle at a stoplight.
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maybe we can approach this a different way. if you want a stick, go to the bone yard, and get the 5-speed change over and computer from another truck. use a gear vendors unit in the UNDERDRIVE MODE, this turns your 3.08 gear out back into a 3.90 set in effect. you can use it as a gear splitter as a perk. now you have a 10 speed, just like a peterbilt! as for the engine... how about the edelbrock tbi manifold #3704, a trans dapt open spacer, and use the throttle body and injectors from a 454? i did a camquest6 dyno sim for you.. afr 195 heads,202 x 160 valves, standard flow dual plane manifold with 700 cfm 2v, 9 to 1 comp. small tube headers with cats/mufflers, it suggested hydraulic roller cam #08-422-8, 218-224 duration at 50, 110 degree LSA, 0.495-0.502 valve lift..... the sim says it makes 369 hp @5,500 rpm, 412 LBS FT @4,000 rpm. it will require a computer reprogramming.... food for thought

p.s. bud, check out the cfm technologies web site! a little additional info... the later new venture 5-speed truck trans has a first gear ratio of about 5.5 to 1 ... so youd want to start out in first gear in direct, then shift into second gear and underdrive it, shift the gear vendors into direct at SHIFT time, and repeat the process, etc.